DENTAL HYGIENIC STUDY OF SCHOOL CHILDREN IN BEPPU HOT SPRING REGION : 3. RELATION BETWEEN THE HOT SPRING AND THE SHEDDING TIME OF DECIDUOUS TEETH

Abstract

With an aim to know the possible influences of hot spring upon the physique, the eruption time of permanent teeth, the shedding time of deciduous teeth, the eruption of permanent teeth and decaying tooth number, 1914 school children residing in Beppu hot spring region and 929 school children of Toyooka-machi, neibouring town with similar living environment, were investigated. 1. The shedding time of deciduous teeth of school children living in the hot spring region is earlier than that of the children living in the nearby region lacking hot spring. 2. The shedding time of deciduous teeth of girl is earlier than that of the boy. 3. The order of shedding of each deciduous tooth reported here in this paper stands in fairly good agreement with those reported by other investigaters.